build and cache mdbook instead of using cargo binstall

[emuell]

• fixes mdbook errors in github runners

[github-actions]

Benchmark for 2ce50e4

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Test	Base	PR	%
Cycle/Generate	58.5±0.62µs	58.5±0.49µs	0.00%
Cycle/Parse	310.1±6.45µs	314.2±5.55µs	+1.32%
Rust Phrase/Clone	432.7±3.74ns	433.2±5.22ns	+0.12%
Rust Phrase/Create	63.2±0.99µs	64.9±1.70µs	+2.69%
Rust Phrase/Run	691.9±4.38µs	680.4±5.58µs	-1.66%
Rust Phrase/Seek	160.7±303.76µs	159.3±300.48µs	-0.87%
Scripted Phrase/Clone	622.7±5.81ns	626.9±9.31ns	+0.67%
Scripted Phrase/Create	934.5±15.70µs	929.5±13.99µs	-0.54%
Scripted Phrase/Run	1803.1±12.42µs	1781.5±11.04µs	-1.20%
Scripted Phrase/Seek	229.1±463.79µs	228.9±464.36µs	-0.09%

[github-actions]

Benchmark for 874996c

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Test	Base	PR	%
Cycle/Generate	58.2±0.46µs	58.6±0.93µs	+0.69%
Cycle/Parse	309.8±2.54µs	331.7±13.08µs	+7.07%
Rust Phrase/Clone	431.5±4.75ns	451.2±6.47ns	+4.57%
Rust Phrase/Create	63.4±0.84µs	66.5±1.47µs	+4.89%
Rust Phrase/Run	680.0±23.82µs	668.1±11.10µs	-1.75%
Rust Phrase/Seek	160.0±302.16µs	158.8±299.29µs	-0.75%
Scripted Phrase/Clone	655.1±9.53ns	629.3±8.02ns	-3.94%
Scripted Phrase/Create	952.3±13.69µs	954.5±8.52µs	+0.23%
Scripted Phrase/Run	1794.6±24.97µs	1817.2±143.70µs	+1.26%
Scripted Phrase/Seek	226.0±458.60µs	229.7±464.91µs	+1.64%

[github-actions]

Benchmark for 6ac4f01

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Test	Base	PR	%
Cycle/Generate	58.9±0.43µs	58.5±0.71µs	-0.68%
Cycle/Parse	317.6±4.24µs	316.5±4.11µs	-0.35%
Rust Phrase/Clone	432.2±5.57ns	434.8±7.10ns	+0.60%
Rust Phrase/Create	64.5±0.98µs	64.3±0.87µs	-0.31%
Rust Phrase/Run	672.1±6.05µs	685.1±40.22µs	+1.93%
Rust Phrase/Seek	158.8±299.08µs	160.2±302.79µs	+0.88%
Scripted Phrase/Clone	624.9±8.27ns	628.1±11.11ns	+0.51%
Scripted Phrase/Create	934.2±17.70µs	946.3±21.50µs	+1.30%
Scripted Phrase/Run	1785.7±30.22µs	1807.8±29.87µs	+1.24%
Scripted Phrase/Seek	228.0±461.65µs	227.4±460.23µs	-0.26%

[github-actions]

Benchmark for 6ecf775

Click to view benchmark

Test	Base	PR	%
Cycle/Generate	58.4±0.57µs	58.5±0.97µs	+0.17%
Cycle/Parse	323.7±7.21µs	315.2±4.08µs	-2.63%
Rust Phrase/Clone	442.9±3.62ns	445.3±15.15ns	+0.54%
Rust Phrase/Create	65.5±1.11µs	64.6±4.28µs	-1.37%
Rust Phrase/Run	681.9±14.91µs	668.4±5.80µs	-1.98%
Rust Phrase/Seek	161.0±303.79µs	158.0±297.42µs	-1.86%
Scripted Phrase/Clone	629.0±9.35ns	643.7±9.50ns	+2.34%
Scripted Phrase/Create	953.6±85.99µs	943.5±32.66µs	-1.06%
Scripted Phrase/Run	1812.7±6.50µs	1791.3±18.94µs	-1.18%
Scripted Phrase/Seek	227.1±459.22µs	226.6±458.60µs	-0.22%